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답안 #1026829

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1026829 2024-07-18T12:10:43 Z hotboy2703 Sky Walking (IOI19_walk) C++14
33 / 100
 731 ms 174252 KB 
#include "walk.h"
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define pll pair <ll,ll>
#define fi first
#define se second
#define MP make_pair
#define sz(a) (ll((a).size()))
#define BIT(mask,i) (((mask) >> (i))&1)
#define MASK(i) (1LL << (i))
struct walk{
    ll l,r,y;
};
vector <walk> all;
const ll MAXN = 1e5 + 100;
const ll INF = 1e18;
vector <pll> g[MAXN*20];
ll dist[MAXN*20];
ll dijkstra(ll s,ll t){
    memset(dist,0x3f,sizeof dist);
    dist[s] = 0;
    priority_queue <pll,vector <pll> ,greater <> > q;
    q.push(MP(dist[s],s));
    while (!q.empty()){
        auto u = q.top().se;
        ll val = q.top().fi;
        q.pop();
        if (dist[u] != val)continue;
        for (auto tmp:g[u]){
            ll v = tmp.fi,w = tmp.se;
            if (dist[u] + w < dist[v]){
                dist[v] = dist[u] + w;
                q.push(MP(dist[v],v));
            }
        }
    }
    if (dist[t] >=INF)dist[t] = -1;
    return dist[t];
}
ll SUSSYBAKA;
struct point{
    ll x,y,id;
    point(ll x1=-1,ll y1=-1):x(x1),y(y1),id(x1==-1?-1:SUSSYBAKA++){
    }
    bool operator < (const point &p)const {
        return MP(x,y)<MP(p.x,p.y);
    }
    bool operator == (const point &p)const {
        return MP(x,y)==MP(p.x,p.y);
    }
};
vector <point> vertices;
long long min_distance(std::vector<int> X, std::vector<int> h, std::vector<int> l, std::vector<int> r, std::vector<int> y, int S, int G){
    ll m = sz(l);
    ll n = sz(X);
    for (ll i = 0;i < m;i ++){
        all.push_back({l[i],r[i],y[i]});
    }
    sort(all.begin(),all.end(),[](walk a1,walk a2){return a1.y<a2.y;});
    vector <ll> order;
    order.resize(n);
    iota(order.begin(),order.end(),0);
    sort(order.begin(),order.end(),[&](ll x,ll y){return h[x] > h[y];});
    vertices.emplace_back(X[S],0);
    vertices.emplace_back(X[G],0);
    for (auto x:all){
        vertices.emplace_back(X[x.l],x.y);
        vertices.emplace_back(X[x.r],x.y);
    }
    auto add_vertex = [&](bool inv){
        vector <ll> bd;
        for (ll i = inv?n-1:0;inv?i>=0:i<n;inv?i--:i++){
//            cout<<i<<endl;
            if (sz(bd) && h[bd.back()] < h[i])bd.pop_back();
            bd.push_back(i);
            if (i==S||i==G){
                ll ptr = sz(bd)-1;
                for (auto x:all){
                    while (ptr>=0&&h[bd[ptr]] < x.y)ptr--;
                    if (x.l <= ptr && ptr <= x.r){
                        vertices.emplace_back(X[bd[ptr]],x.y);
                    }
                }
            }
        }
    };
    add_vertex(0);
    add_vertex(1);
//    return -1;
    vector <pair <pll,bool> > event;
    for (auto x:all){
        event.emplace_back(MP(X[x.l],x.y),1);
        event.emplace_back(MP(X[x.r]+1,x.y),0);
    }
    sort(event.begin(),event.end());
    sort(vertices.begin(),vertices.end());
    vertices.resize(unique(vertices.begin(),vertices.end())-vertices.begin());

    {
        ll ptr = 0;
        multiset <ll> ms;
        vector <pll> Tm;
        for (auto x:vertices){
            while (ptr<sz(event) && event[ptr].fi.fi <= x.x){
                if (event[ptr].se)ms.insert(event[ptr].fi.se);
                else ms.erase(ms.find((event[ptr].fi.se)));
                ptr++;
            }
            auto tmp = ms.upper_bound(x.y);
            if (tmp != ms.end())Tm.emplace_back(x.x,*(tmp));
            tmp = ms.lower_bound(x.y);
            if (tmp != ms.begin())Tm.emplace_back(x.x,*prev(tmp));
        }
        for (auto x:Tm)vertices.emplace_back(x.fi,x.se);
    }
    sort(vertices.begin(),vertices.end());
    vertices.resize(unique(vertices.begin(),vertices.end())-vertices.begin());
    auto add_edge = [&](point a1,point a2){
        ll w = abs(a1.x-a2.x) + abs(a1.y-a2.y);
        g[a1.id].push_back(MP(a2.id,w));
        g[a2.id].push_back(MP(a1.id,w));
    };

    for (ll j = 0;j + 1 < sz(vertices);j ++){
        if (vertices[j].x == vertices[j+1].x)add_edge(vertices[j],vertices[j+1]);
    }
    auto cmp_y = [](point a1,point a2){return MP(a1.y,a1.x) < MP(a2.y,a2.x);};
    sort(vertices.begin(),vertices.end(),cmp_y);
    auto fi = [&](pll x){
        return lower_bound(vertices.begin(),vertices.end(),x,
                           [](point a1,pll val){return MP(a1.y,a1.x) < MP(val.se,val.fi);})-vertices.begin();
    };
    vector <ll> cnt(sz(vertices));
    for (auto x:all){
        cnt[fi(MP(X[x.l],x.y))] ++;
        cnt[fi(MP(X[x.r],x.y))] --;
    }
    for (ll i = 0;i < sz(vertices);i ++){
        if (i)cnt[i]+=cnt[i-1];
        if (cnt[i]){
            add_edge(vertices[i],vertices[i+1]);
        }
    }
    for (ll i = 0;i < sz(vertices);i ++){
        if (MP(vertices[i].x,vertices[i].y) == MP(ll(X[S]),0LL))S = vertices[i].id;
        if (MP(vertices[i].x,vertices[i].y) == MP(ll(X[G]),0LL))G = vertices[i].id;

    }
    return dijkstra(S,G);
}

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 10 ms 63068 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 11 ms 63068 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 78 ms 76244 KB Output is correct
2 Correct 450 ms 138384 KB Output is correct
3 Correct 525 ms 141596 KB Output is correct
4 Correct 588 ms 146016 KB Output is correct
5 Correct 660 ms 149040 KB Output is correct
6 Correct 612 ms 145640 KB Output is correct
7 Correct 266 ms 106520 KB Output is correct
8 Correct 232 ms 97544 KB Output is correct
9 Correct 561 ms 145388 KB Output is correct
10 Correct 270 ms 116644 KB Output is correct
11 Correct 18 ms 64328 KB Output is correct

Subtask #4
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 78 ms 76244 KB Output is correct
2 Correct 450 ms 138384 KB Output is correct
3 Correct 525 ms 141596 KB Output is correct
4 Correct 588 ms 146016 KB Output is correct
5 Correct 660 ms 149040 KB Output is correct
6 Correct 612 ms 145640 KB Output is correct
7 Correct 266 ms 106520 KB Output is correct
8 Correct 232 ms 97544 KB Output is correct
9 Correct 561 ms 145388 KB Output is correct
10 Correct 270 ms 116644 KB Output is correct
11 Correct 18 ms 64328 KB Output is correct
12 Correct 531 ms 143760 KB Output is correct
13 Correct 409 ms 146396 KB Output is correct
14 Correct 693 ms 174252 KB Output is correct
15 Correct 532 ms 129120 KB Output is correct
16 Correct 455 ms 136944 KB Output is correct
17 Correct 527 ms 149176 KB Output is correct
18 Correct 455 ms 130472 KB Output is correct
19 Correct 472 ms 137644 KB Output is correct
20 Correct 285 ms 107020 KB Output is correct
21 Correct 36 ms 66200 KB Output is correct
22 Correct 425 ms 134936 KB Output is correct
23 Correct 419 ms 131496 KB Output is correct
24 Correct 335 ms 121344 KB Output is correct
25 Correct 382 ms 126596 KB Output is correct
26 Correct 309 ms 123980 KB Output is correct
27 Correct 731 ms 167300 KB Output is correct
28 Correct 426 ms 148292 KB Output is correct
29 Correct 672 ms 156884 KB Output is correct
30 Correct 291 ms 110576 KB Output is correct
31 Correct 655 ms 155320 KB Output is correct
32 Correct 237 ms 111168 KB Output is correct
33 Correct 268 ms 119240 KB Output is correct
34 Correct 288 ms 120000 KB Output is correct
35 Correct 332 ms 120320 KB Output is correct
36 Correct 271 ms 110480 KB Output is correct
37 Correct 268 ms 105676 KB Output is correct
38 Correct 273 ms 117692 KB Output is correct
39 Correct 338 ms 124468 KB Output is correct
40 Correct 287 ms 115500 KB Output is correct
41 Correct 239 ms 109728 KB Output is correct

Subtask #5
0 / 43.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 10 ms 63068 KB Output isn't correct
2 Halted 0 ms 0 KB -